Flange Types Guide: Weld Neck, Slip-On, Socket Weld & Selection

Short answer: Pipeline flanges come in several types matched to service: weld neck for high-pressure and cyclic duty, slip-on for low-cost low-pressure joints, socket weld for small-bore high-pressure lines, blind for closures and lap joint for easy dismantling — chosen by pressure, temperature, bore and how often the joint is broken.

At a Glance

Reading a Flange Spec

Flanges are defined by standard (ASME B16.5 / EN 1092), rating (150# to 2500# or PN), bore and facing. Pressure-temperature and grade data are in our Steel Grade Chart; dimensions per Tolerances Fits Guide. They pair with our Steel Pipe Supplier 그리고 Pipe Fittings Supplier.

Weld Neck vs Slip-On

Weld neck has a long tapered hub butt-welded to the pipe for high stress and thermal cycling; slip-on is cheaper, fillet-welded, and fine for low-pressure, low-cyclic service. Plate quality for flanges comes from our Steel Plate Supplier 그리고 Stainless Plate Supplier.

Small Bore and Specials

Socket weld flanges suit small-bore high-pressure lines with a fillet weld and a gap for thermal growth; blind flanges close or isolate a line; lap joint flanges with a stub end allow frequent take-apart without rotating the flange. Welding is detailed in our Welded Tube Guide.

Choosing a Flange

Specify weld neck for critical high-pressure and cyclic service, slip-on to save cost at low rating, socket weld for small high-pressure bores, and lap joint where the joint is opened often — and confirm rating, facing and the matching grade with the pipe.

Get a Quote

Tell HXSCO your requirements and we will respond with a competitive quote and lead time.

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